Add optimistic updates and cache synchronization

[Goodnessoj]

Summary (#219)

• Add reusable optimistic cache helpers and wire preference updates to immediate cache patches with rollback on failure.
• Write confirmed access-check and attestation mutation results into exact TanStack Query cache entries for cross-screen synchronization.
• Add targeted attestation invalidation for issuer-key refreshes and document the optimistic update rules for future contributors.

Closes #219

Tests

• ./node_modules/.bin/vitest run tests/optimisticCache.test.ts tests/hooks/useUpdatePreferences.test.tsx tests/attestationQueryCache.test.ts tests/hooks/useAccessCheckMutation.test.ts tests/mutationQueue.test.ts tests/mutationReplayer.test.ts tests/hooks/useGuilds.test.ts tests/hooks/useMembership.test.ts tests/offlineCache.test.ts tests/passCache.test.ts tests/walletScopedCache.test.ts